Zircon U-Pb age and geochemistry of Late Triassic intrusive rocks in Qinghe area, eastern Liaoning Province and its indication to the tectonic evolution of the eastern North China Craton
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摘要:
辽东清河地区发育二长闪长岩和二长花岗岩2类侵入岩, 通过对其开展系统的LA-ICP-MS锆石U-Pb测年及地球化学研究, 探讨晚三叠世辽东清河地区的岩浆侵位机制及大地构造背景。二长闪长岩和二长花岗岩的LA-ICP-MS锆石U-Pb年龄加权平均值分别为212±2 Ma和221±2 Ma, 时代为晚三叠世。地球化学分析结果显示: 二长闪长岩SiO2含量(50.44%~55.18%, 平均52.20%)中等, MgO(3.18%~6.2%, 平均5.20%)、TFe2O3(7.83%~8.85%, 平均8.37%)和总碱(7.04%~8.00%, 平均7.50%)含量较高, 表明清河地区二长闪长岩属于准铝质钾玄岩系列岩石; 岩石富集大离子亲石元素(LILE), 相对亏损高场强元素(HFSE), 中等的Nd/Th(3.70~9.75, 平均5.83)和Rb/Sr值(0.07~0.12, 平均值为0.09), 较高的Nb/U值(9.11~13.2, 平均10.8), 显示了主要由壳源物质组成, 同时有少量幔源物质的加入。二长花岗岩具有富SiO2(76.10%~76.80%, 平均77.12%)、贫MgO和TFe2O3的特征, 其岩浆成分以地壳中的硅铝质成分为主, 属于过铝质的Ⅰ型花岗岩, 同时亏损高场强元素Nb、Ta、P、Ti, Nd/Th值(0.62~1.73, 平均1.23)接近壳源岩石值, 暗示其原始岩浆应是起源于陆壳物质的部分熔融。通过岩石学、年代学、岩石地球化学、构造环境分析, 并结合辽东半岛区域构造演化研究, 认为二长闪长岩为扬子克拉通深俯冲与华北克拉通后伸展作用的结果, 二长花岗岩花岗岩为同碰撞挤压环境。
Abstract:Monzodiorite and monzogranite are developed in Qinghe area of Liaodong Peninsula, which is located in the east of North China Craton.We have carried out systematic LA-ICP-MS zircon U-Pb dating and geochemistry of the two types of intrusive rocks to explore the magmatic emplacement mechanism and tectonic background of Qinghe area of Liaodong Peninsula in the Late Triassic.The weighted average zircon U-Pb ages of monzodiorite and monzogranite are 212 ±2 Ma and 221 ±2 Ma, respectively.According to geochemical analysis, monzodiorite has medium SiO2 content(50.44%~55.18%, with an average of 52.20%), high MgO(3.18%~6.2%, with an average of 5.20%), TFe2O3(7.83%~8.85%, with an average of 8.37%)and total alkali(7.04%~8.00%, with an average of 7.50%), indicating that the monzodiorite in Qinghe area belongs to quasi aluminous shoshonite series.The rocks are enriched with large ion lithophile elements(LILE), relatively deficient in high field strength elements(HFSE), medium Nd/Th(3.70~9.75, average 5.83)and Rb/Sr(0.07~0.12, average 0.09)ratios, and high Nb/U(9.11~13.2, average 10.8)ratios, indicating that they are mainly composed of crust derived materials and a small amount of mantle derived materials.Monzogranite is rich in SiO2(76.10%~76.80%, with an average of 77.12%), poor in MgO and TFe2O3.Its magmatic composition is mainly composed of siliceous and aluminous components in the crust, belonging to peraluminous Ⅰ-type granite.At the same time, it is deficient in high field strength elements Nb, Ta, P and Ti, and the Nd/Th(0.62~1.73, average 1.23)ratios are close to the value of crust source rock, suggesting that the original magma should be a partial melting of continental crust materials.Through the analysis of petrology, geochronology, geochemistry and tectonic environment, combined with the study of regional tectonic evolution of Liaodong Peninsula, it is considered that the monzodiorite is the result of deep subduction of the Yangtze craton and post extension of the North China craton, and the monzogranite is in the syn-collision and compression environment.
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Key words:
- Late Triassic /
- monzonodiorite /
- monzonitic granite /
- zircon U-Pb dating /
- Liaodong Peninsula /
- North China Craton
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图 1 辽东岫岩黄花甸地区地质简图(a，据刘杰勋等，2016修改)和大地构造位置(b，据Li et al., 2017修改)
Figure 1.
图 5 清河地区二长闪长岩与二长花岗岩球粒陨石标准化稀土元素配分模式图(a，标准化值据Boynton, 1984)和原始地幔标准化微量元素蛛网图(b，标准化值据Mcdonough et al., 1992)
Figure 5.
图 6 辽东半岛晚三叠世侵入岩地质简图(据Quan et al., 2020修改)
Figure 6.
表 1 清河二长闪长岩(D328Zr2)及二长花岗岩(D328Zr1)LA-ICP-MS锆石U-Th-Pb测试结果
Table 1. LA-ICP-MS zircon U-Th-Pb data for monzonodiorite(D328Zr2) and monzonitic granite(D328Zr1)in Qinghe area
测点号 元素含量/10-6 Th/U 同位素比值 年龄/Ma Pb Th U 206Pb/207Pb 1σ 207Pb/235U 1σ 206Pb/238U 1σ 206Pb/207Pb 1σ 207Pb/235U 1σ 206Pb/238U 1σ D328Zr1-1 89.97 1184 2288 0.52 0.0515 0.0008 0.2476 0.0041 0.0348 0.0003 265 35 225 3 220 2 D328Zr1-2 103.8 1117 2676 0.42 0.0545 0.0008 0.2602 0.0054 0.0345 0.0005 394 36 235 4 219 3 D328Zr1-3 107.0 2021 2470 0.82 0.0534 0.0009 0.2533 0.0042 0.0344 0.0004 346 40 229 3 218 2 D328Zr1-4 50.18 450.0 1291 0.35 0.0522 0.0012 0.2558 0.0062 0.0354 0.0004 295 52 231 5 225 2 D328Zr1-5 50.60 405.0 1326 0.31 0.0544 0.0018 0.2625 0.0092 0.0349 0.0005 387 69 237 7 221 3 D328Zr1-6 99.14 1262 2493 0.51 0.0523 0.0009 0.2465 0.0047 0.0342 0.0004 298 44 224 4 217 2 D328Zr1-7 99.96 996.0 2541 0.39 0.0541 0.0011 0.2599 0.0054 0.0349 0.0004 376 44 235 4 221 2 D328Zr1-8 220.1 2642 5684 0.46 0.0527 0.0011 0.2502 0.0067 0.0343 0.0004 317 14 227 5 217 2 D328Zr1-9 83.22 1256 2077 0.60 0.0516 0.0008 0.2461 0.0044 0.0346 0.0003 333 35 223 4 219 2 D328Zr1-10 91.24 1339 2288 0.59 0.0511 0.0008 0.2449 0.0040 0.0348 0.0003 243 37 222 3 221 2 D328Zr1-11 97.39 1465 2451 0.60 0.0527 0.0010 0.2491 0.0042 0.0345 0.0003 322 17 226 3 218 2 D328Zr1-12 104.76 1212 2733 0.44 0.0508 0.0008 0.2448 0.0039 0.0350 0.0003 232 69 222 3 222 2 D328Zr1-13 94.34 1409 2382 0.59 0.0513 0.0009 0.2456 0.0043 0.0348 0.0003 254 44 223 3 220 2 D328Zr1-14 233.2 2453 6000 0.41 0.0533 0.0016 0.2598 0.0078 0.0353 0.0003 343 67 235 6 224 2 D328Zr1-15 47.21 719.0 1192 0.60 0.0523 0.0014 0.2529 0.0065 0.0352 0.0004 302 64 229 5 223 2 D328Zr1-16 102.6 1197 2680 0.45 0.0519 0.0010 0.2470 0.0047 0.0346 0.0003 280 43 224 4 219 2 D328Zr1-17 47.85 851.0 1147 0.74 0.0529 0.0016 0.2552 0.0079 0.0351 0.0004 324 70 231 6 222 3 D328Zr1-18 74.06 895.0 1899 0.47 0.0507 0.0010 0.2441 0.0053 0.0349 0.0003 233 42 222 4 221 2 D328Zr1-19 46.31 1071 1039 1.03 0.0529 0.0014 0.2542 0.0070 0.0349 0.0004 324 59 230 6 221 3 D328Zr1-20 88.94 1004 2299 0.44 0.0505 0.0011 0.2477 0.0061 0.0355 0.0004 217 84 225 5 225 2 D328Zr2-1 25.68 598.0 547.0 1.09 0.0520 0.0018 0.2422 0.0095 0.0336 0.0004 283 78 220 8 213 3 D328Zr2-2 34.81 946.0 680.0 1.39 0.0530 0.0017 0.2471 0.0085 0.0336 0.0004 328 70 224 7 213 3 D328Zr2-3 22.21 532.0 486.0 1.09 0.0513 0.0017 0.2339 0.0085 0.0330 0.0005 254 78 213 7 209 3 D328Zr2-4 29.68 456.0 703.0 0.65 0.0510 0.0013 0.2383 0.0064 0.0339 0.0005 243 59 217 5 215 3 D328Zr2-5 23.56 593.0 489.0 1.21 0.0563 0.0019 0.2550 0.0076 0.0330 0.0004 465 105 231 6 209 2 D328Zr2-6 43.21 709.0 1068 0.66 0.0507 0.0012 0.2264 0.0050 0.0325 0.0004 228 52 207 4 206 3 D328Zr2-7 27.80 561.0 641.0 0.87 0.0486 0.0014 0.2225 0.0069 0.0333 0.0005 128 70 204 6 211 3 D328Zr2-8 58.00 1826 1171 1.56 0.0523 0.0011 0.2447 0.0064 0.0337 0.0005 302 46 222 5 214 3 D328Zr2-9 45.96 1488 889.0 1.67 0.0562 0.0016 0.2593 0.0069 0.0334 0.0003 461 61 234 6 212 2 D328Zr2-10 22.74 591.0 496.0 1.19 0.0539 0.0023 0.2545 0.0121 0.0340 0.0007 369 64 230 10 216 4 D328Zr2-11 20.80 531.0 483.0 1.10 0.0495 0.0019 0.2232 0.0089 0.0330 0.0007 172 87 205 7 210 5 D328Zr2-12 18.44 469.0 410.0 1.14 0.0502 0.0016 0.2312 0.0075 0.0334 0.0004 206 76 211 6 212 3 D328Zr2-13 28.75 853.0 601.0 1.42 0.0539 0.0016 0.2530 0.0091 0.0338 0.0005 369 69 229 7 214 3 D328Zr2-14 29.49 562.0 687.0 0.82 0.0557 0.0020 0.2617 0.0093 0.0341 0.0005 443 80 236 7 216 3 
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表 2 清河二长闪长岩及二长花岗岩捕虏体主量、稀土和微量元素分析结果
Table 2. Major, trace element and rare earth element compositions of diorite in Qinghe area
元素 二长闪长岩 二长花岗岩 D328-2-4 D328-2-5 D328-2-1 D328-2-2 D328-1-1 D328-1-2 D328-1-3 D328-1-4 D328-1-5 SiO2 52.86 52.22 55.18 50.44 77.10 77.10 76.80 77.10 77.50 Al2O3 16.4 14.5 17.8 16.1 13.2 13.3 13.1 13.2 13.0 Fe2O3 1.22 1.98 1.76 1.66 0.35 0.26 0.31 0.15 0.20 FeO 5.95 6.18 5.95 6.08 1.38 1.00 1.16 0.51 0.41 CaO 6.51 6.03 4.9 6.11 1.77 1.7 1.69 1.45 1.38 MgO 5.46 6.20 3.18 5.98 0.50 0.37 0.41 0.18 0.20 K2O 3.75 4.42 3.59 4.58 1.11 0.96 1.06 1.56 1.53 Na2O 3.59 2.60 3.79 3.39 4.28 4.69 4.76 5.25 4.99 MnO 0.13 0.14 0.11 0.14 0.03 0.02 0.03 0.03 0.02 P2O5 0.62 0.21 0.66 0.59 0.03 0.03 0.03 0.03 0.03 TiO2 1.38 1.04 1.65 1.91 0.11 0.09 0.11 0.04 0.06 烧失量 1.00 4.18 0.79 1.75 0.48 0.55 0.47 0.24 0.34 总计 99.47 102.66 100.15 100.19 100.34 100.07 99.92 99.74 99.66 K2O/Na2O 1.04 1.70 0.95 1.35 0.26 0.20 0.22 0.30 0.31 K2O+Na2O 7.46 7.04 7.42 8.06 5.39 5.65 5.82 6.81 6.52 A/CNK 0.75 0.72 0.94 0.74 1.15 1.12 1.09 1.02 1.05 A/NK 1.65 1.60 1.76 1.52 1.60 1.52 1.46 1.28 1.32 AR 1.94 2.04 1.96 2.12 2.13 2.21 2.30 2.74 2.66 Mg# 58.0 58.1 42.9 58.5 34.5 34.8 33.7 33.2 37.7 Ni 37.8 217 13.5 27.0 16.5 13.3 13.5 7.52 7.38 Ba 3493 497.0 1460 1325 326.0 258.0 223.0 724.0 691.0 Co 24.2 40.7 19.5 33.4 7.50 6.07 6.88 2.87 2.87 Cr 179 509 23.0 109 29.4 22.5 28.1 6.43 8.91 Nb 18.5 7.20 23.5 17.7 4.80 4.14 3.85 3.82 4.32 Rb 96.6 48.1 126 73.0 33.2 27.8 30.0 47.1 52.8 Sr 1274 497.0 1072 1062 251.0 272.0 250.0 508.0 454.0 V 134 172 63.8 178 22.8 18.1 21.6 6.10 5.30 Zr 302 323 348 382 117 108 103 134 106 Hf 7.35 3.61 8.23 8.39 6.12 4.89 5.36 5.59 4.84 Ta 0.82 0.39 1.07 1.09 0.10 0.10 0.58 0.11 0.11 Li 18.7 19.7 18.6 27.8 9.46 6.68 8.00 4.22 1.58 Th 17.0 5.60 22.5 7.49 8.21 7.37 6.83 12.5 13.4 U 1.4 0.79 2.36 1.62 1.28 1.41 1.37 2.05 2.25 La 126 28.0 131 84.8 22.0 18.9 19.5 14.4 15.3 Ce 235 151.4 248 165 33.2 32.2 31.2 22.6 24.2 Pr 26.3 6.48 25.1 19.1 3.45 3.26 3.17 2.18 2.26 Nd 92.6 24.8 83.3 73.0 12.9 11.9 11.7 7.78 8.72 Sm 11.9 4.21 10.6 10.9 2.05 1.9 1.91 1.43 1.43 Eu 2.58 1.39 2.64 2.73 0.88 0.84 0.94 0.93 0.99 Gd 11.8 3.30 11.7 9.49 2.61 2.09 2.18 1.52 1.56 Tb 1.43 0.55 1.17 1.47 0.36 0.32 0.34 0.23 0.25 Dy 5.79 3.40 4.76 6.02 1.60 1.14 1.26 0.75 0.79 Ho 1.08 0.67 0.85 1.21 0.33 0.23 0.26 0.17 0.18 Er 3.11 1.68 2.23 3.18 0.87 0.68 0.67 0.50 0.58 Tm 0.43 0.27 0.36 0.47 0.13 0.086 0.13 0.072 0.092 Yb 2.40 1.70 2.00 2.73 0.99 0.85 0.92 0.65 0.72 Lu 0.37 0.24 0.34 0.42 0.19 0.16 0.15 0.16 0.16 Y 28.5 16.7 26.8 31.6 7.42 6.13 6.50 4.03 4.66 ∑REE 520.8 228.1 524.1 380.5 81.56 74.56 74.33 53.37 57.23 LREE/HREE 18.72 18.31 21.39 14.23 10.52 12.42 11.58 12.17 12.21 (La/Yb)N 35.40 11.10 44.16 20.94 14.98 14.99 14.29 14.94 14.33 δEu 0.66 1.10 0.72 0.80 1.16 1.28 1.40 1.92 2.02 注：主量元素含量单位为%，稀土和微量元素含量单位为10-6
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